Decreasing Power Output Increases Aerobic Contribution During Low-Volume Severe-Intensity Intermittent Exercise

摘要

Lisboa, FD, Salvador, AF, Raimundo, JAG, Pereira, KL, de Aguiar, RA, and Caputo, F. Decreasing power output increases aerobic contribution during low-volume severe-intensity intermittent exercise. J Strength Cond Res 29(9): 2434-2440, 2015-High-intensity interval training applied at submaximal, maximal, and supramaximal intensities for exercising at Vo(2)max (t95Vo(2)max) has shown similar adaptation to low-volume sprint interval training among active subjects. Thus, the aim of the present study was to investigate t95Vo(2)max during 2 different intermittent exercises in the severe-intensity domain (e.g., range of power outputs over which Vo(2)max can be elicited during constant-load exercise) and to identify an exercise protocol that reduces the time required to promote higher aerobic demand. Eight active men (22 +/- 2 years, 72 +/- 5 kg, 174 +/- 4 cm, 47 +/- 8 ml center dot kg(-1)center dot min(-1)) completed the following protocols on a cycle ergometer: (a) incremental test, (b) determination of critical power (CP), (c) determination of the highest constant intensity (I-HIGH) and the lowest exercise duration (T-LOW) in which Vo(2)max is attained, and (d) 2 exercise sessions in a randomized order that consisted of a constant power output (CPO) session at I-HIGH and a decreasing power output (DPO) session that applied a decreasing work rate profile from I-HIGH to 110% of CP. Time to exhaustion was significantly longer in DPO (371 +/- 57 seconds vs. 225 +/- 33 seconds). Moreover, t95Vo(2)max (186 +/- 72 seconds vs. 76 +/- 49 seconds) and O-2 consumed (29 +/- 4 L vs. 17 +/- 3 L) were higher in DPO when compared with the CPO protocol. In conclusion, data suggest that the application of a DPO protocol during intermittent exercise increases the time spent at high percentages of Vo(2)max.